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• FFMPEG : how to overlay a moving PNG with multiply blend effect (overlay filter + blend filter) [closed]

  22 avril 2024, par user24565885

  I tried hunting for all existing questions and couldn't find a match :-(

  


  I have a video and a PNG image that I overlay on top of that. The PNG needs to move across the video (this I have working). But I want the PNG to use a "multiply" blend effect vs. a standard alpha overlay. Whenever I try to apply both filters I get an error.

  


  This code works and moves the image (the last one) across as expected :

  


  ffmpeg -i d6b5ec90-8823-41cf-9b81-3086ce83054a.mp4   -loop 1 -i 593e677d-02bb-49c2-a0c6-c3dd8f8c2f72.png  -loop 1 -i 32fea58f-ebe1-447e-b079-06f8ebb9df52.png  -loop 1 -i cb7435fb-5aff-4eeb-af2a-22b92c900db6.png -filter_complex "[0]fps=30,scale=3840:3840[o1];[1]fps=30,setpts=PTS+0.000/TB[t_1];[o1][t_1]overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2:enable='between(t,0.000,5.000)':shortest=1[o2];[2]fps=30,setpts=PTS+1.000/TB[t_2];[o2][t_2]overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2:enable='between(t,1.000,5.000)':shortest=1[o3];[3]fps=30[t_3];[o3][t_3]overlay='main_w*(1.5+(0-1.5)*max(0,1-(n-1.000*30)/(4.5*30)))':0:enable='between(t,1.000,4.500)':shortest=1" -r 30 -pix_fmt yuv420p -c:a aac -b:a 128k -c:v libx264 -b:v 8000k out.mp4


  


  I now want that last effect to use multiply for blending and that's what I can't figure out. Applying both filters with a comma seems reasonable but bonks (NOTE : the MP4 and all PNGs are 3840x3840 so it's not a size issue)

  


  [o3][t_3]overlay='main_w*(1.5+(0-1.5)*max(0,1-(n-1.000*30)/(4.5*30)))':0:enable='between(t,1.000,4.500)':shortest=1,blend=all_mode='multiply':all_opacity=1


  


  The error I get is "Cannot find a matching stream for unlabeled input pad 1 on filter Parsed_blend_10".

  


  I've looked at this one : In FFmpeg, using -filter_complex, how can I overlay and blend at the same time ? but can't quite figure out how I would split, blend, then overlay in my situation where the last input PNG ([3]) needs to blend and move...

  


  Would really appreciate the help if anyone has a solution.

  


  THANKS !

  


• Android and FFmpeg. Video is very slow

  6 février 2014, par bukka.wh

  I have built ffmpeg library for my Android device from here : https://github.com/appunite/AndroidFFmpeg. But some video files playing very very slow (i find out that very slow are playing videos which my Android device can play by itself). Here is build.sh script
  https://github.com/appunite/AndroidFFmpeg/blob/master/FFmpegLibrary/jni/build_android.sh

  May be this is because of these lines :

  --enable-hwaccel=h264_vaapi \
  
  --enable-hwaccel=h264_vaapi \
  
  --enable-hwaccel=h264_dxva2 \
  
  --enable-hwaccel=mpeg4_vaapi \

  As I have understood these lines are enabling hw acceleration (the author of that code says that this can raise some bugs). The basic idea of the player is to decode video and audio streams in native code, then render video frame into AndroidBitmap and render Audio into Android MediaPlayer.
  Does anyone know how to solve problem of slow video decoding (maybe decrease video frame resolution or something else ?) I will be pleased for any help and ideas.

• ffmpeg : how to stream from rtmp to FLS ?

  21 juin 2016, par yarek

  I can create HLS from static MPEG4 using that command :

  ffmpeg -i video.mp4 -codec copy -map 0 -f segment -segment_list out.list -segment_time 10 out%03d.ts

  I am now trying to achieve that :

  live RTMP(FME)------->FFMEG-------------->HLS

  

  I tried with :

  ffmpeg -i rtmp://127.0.0.1:1935/live/video -codec copy -map 0 -f segment -segment_list out.list -segment_time 10 out%03d.ts

  But got error :

  Closing connection : NetStream.Play.StreamNotFound
  rtmp ://127.0.0.1:1935/live/video : Unknown error occurred

  Any idea how to achieve :

  RTMP---->FMPEG----->HLS ?

  I also tried :

  ffmpeg -i "rtmp://localhost:1935/live/yarek live=1" -codec copy -map 0 -f segment -segment_list out.list -segment_time 10 out%03d.ts

  Seems better but stucks :

  ble-zlib

  libavutil 52. 0.100 / 52. 0.100
  libavcodec 54. 69.100 / 54. 69.100
  libavformat 54. 35.100 / 54. 35.100
  libavdevice 54. 3.100 / 54. 3.100
  libavfilter 3. 20.106 / 3. 20.106
  libswscale 2. 1.101 / 2. 1.101
  libswresample 0. 16.100 / 0. 16.100
  libpostproc 52. 1.100 / 52. 1.100
  rtmp server sent error
  Metadata :
  videokeyframe_frequency8.00
  avclevel 31.00
  videodevice Microsoft LifeCam Cinema
  keywords
  width 320.00
  videodatarate 350.00
  presetname Custom
  copyright
  creationdate Mon Oct 29 17:51:08 2012
  videocodecid avc1
  author
  avcprofile 66.00
  title
  height 240.00
  description
  rating
  framerate 20.00

  Thanks